Telephone system



May 6, 1930. H. M. FRIENDLY TELEPHONE SYSTEM Fild June 18, 1923 4Sheets-Sheet 1 xii &1

Invenlur- May 6, 1930 M. FRIENDLY 4 TELEPHONE SYSTEM Fil ne 18 19 23 4sheets -sheet 2 I IiWentnr- H Elh arl-P'I-Friendly y 6, 1930. HIM. FRIENLY 1,757,564

' TELEPHONE SYSTEM Filed June 18, 1923 4 Sheets-Sheet 3 Invenmr H. 5 vHEPhEPH Ifi'iBHmLI May 6, 1930." H.. M. FRIENDLY TELEPHONE SYSTEM FiledJune 18, 1923 4 Sheets-Shqet 4 q q A ll mmw m m W g mmu w ..,||Y

E 2mm mm NNV R? q W S a? Inveniur- Herb efl-P'I-m m m em u: 1\. cu m EPatented May 6, 1930 ice,

HERBERT M. FRIEND-LY, or PORTL ND; onneoiw TELEPHONE sys rnirApplication filed June 18,

My invention relates to automatic or ma chineswitchin telephone systems;and Variations thereof. It concerns the signalingcurrent supplyswitching mechanism and tl'ie cross-connecting of the central officeequip ments with relation to the'outside lines. 3 l 7 "An object of theinvention 18 to enableany desired character or harmonic frequency ofsignaling'eurrent to be applied through the connector with specificreference to the line selected when the line is an individual line;Where the line selected is a party line itWi'll have as many ofiic'eb'ranchesas there are signals on the line. The latter statement is tosay there will be an ofice branch and cor-t responding telephonenuinberfor each station on the outside l1i1e,-haV1ng in mind that there branchhaving a distinctive telephone number 'andan' interchangeable associatedsigi1a1- ing current character orharinonio frequency.

This provision of the inventionenablesany desired type orcharacterofsignaling current and correspondingly responsive signaldevice to be employed for an individual line Without changing itscalling number." It alsoenabl'e's any plurality of types or charactersof sig-' naling current-andcorrespondingly selectively responsive signalde'vioes'to'be employedon a party line without changing any callingnumbers for any of the respective subscribers thereof. And it alsoenables any one or more codes of signal current application to be made"toa line, selectively or non-selectivelyeii'ective to a correspondinglyresponsive signal device or deviceswithout changing any cell'- .ingnumbers for any of therespeotive subscribers thereof. l r a A salientobject of the system is, the means lines-may be interchanged and alteredwithoutchanging the calling numbers of the concerned subscribers whereinthe type or char-, acter of the'signahng current and the signal deviceof thesubscriber-or subscribers concerned are or are not. changedincidental to the changed grouping; 'lhat is to say,-the

present system contemplates broadly the interchanging or introduction ofsubscribers c confusion-1 with other codes employed upon theconcerned-line. a whereby the subscriber: grouping on party 1922;; siegeit; eieiiaif- V I signaled'i vhen' onlyone o r'flthe other is may bea'plurahty of central oilice branches I r for any desired statlon onthehne; each said the signaling currentso projectetlbeiiig intercli'arigeably specific to the s'aidbranch; but applied throughthe saidconn'eetor;

Another object of the invention is to pro- -vide a connector switchautomatic control v whereby when a branch of a line" is seizedwhich=contemplates that code signals comprising a plurality of spacedapplications of si nalin'g current will be impressedythat thesaid-applications will initiate only; at the initial" period of thecode." That'is to'say,

code current Will not be" applied initially after the code' per iod' hasbe'ggun and which would thus'c'ausefragmentary code signals to beapplied out upon the line, possibly causing Patent No. 1,565,727,granted December 15, 1925. The present system also relates to the systemdisclosed in my application Serial 7 No. 138,149, filed December 21,1916, and issued as U. S. Patent 1,561,710, granted November 17, 1925.It therefore, comprehends a system with the objects of the saidfiledapplications as functions thereof. i V

The present system thus involves a crossconnecting means whereby anyavailable signaling current supply may be interchangeably associatedwith the set of connector.

bank terminals corresponding to a line or branch of a line so that whenthe said set is seized by the connector the connector will re-' ceivethe prearranged signaling current supply and impress it upon the talkingterminals of the corresponding line orbranch thereof seized. It alsoinvolves a cross-connecting means wherebythe h'nemay. be interchangeablybranched to any desired connector bank terminal set, or likewisebranchedto any plurality thereof in order that the line may be vreachedover any desired set, of connector bank terminals, orover any set of anydesired interchangeable plurality of connector bank operating connectorbanks D for connector A,

7 together with the wipers and cooperating ister.

connector banks B and C of two connectors (notshown) belonging to thegroup containing connector A. a a

Fig. 3 shows signalingcurrent supply apparatus and signaling currentinterchanging terminals cooperative with a bank level of the groupcontaining connector A' and the multipled connector bank levels B, C andD.

ing lines from the outside with relation to the sets of terminals E inFig. 2 of the central oifice equipments. 7 f The circuits employed toillustrate the invention may beassembled by placing Fig. 3 below Fig. 1,andFig. 2 below Fig. 3 so that lines extending to the adjacent marginsreg.-

, With further may be considered as A, C andE respectively,

in the Patent No. 13,901re-issued to Frank Newforth, J r.,'April 13,1915. The connector A is a well known form of connector switch as shownin Fig. 4 of the said Patent No.

7 1,565,727, however, modified to operate in ac- "cordance with thepresent invention. This modification is resident in the, introducedright-hand .relay and associated'circuits', as will bediscussedhereinafter; i V

Fig. 4 shows the method of cross-connect In Fig. 3, the ringing currentinterrupter devices F, G, H, I, J and K are of the general type as theinterrupter shown in Fig. 1 of the patent granted July 4, 1916, No.1,189,882 to H. F. Obergfell. A group of these interrupters is common toa group of'connectors or all of the interrupters may commonly serve anadditlonal group or groups of connectors.

In the present eXampled system, interrupter G is shown as controlledfrom eitherof the two groups to which relays L andM :refer. l/Vhen'theconnector A (or any connector of the group containing said A) seizes aline terminal set in its line terminal bank the common start conductor101 will become extended through armatures 102 and 103 to groundedbattery; This latter function, as will appear presently, willcause the.relay L to actuate and the interrupter devicesF, G, H,I, J and K tostart functioning. As the brush 3010f interrupter F, forexan1ple,isdrawn upward no operative eifect occurs with'reference to the signalingcurrent source 7, but the relay corresponding to 128 of any and everyconnector applying battery from its armature corresponding to 103 tocommon conductor 101 willbe en-ergizedfrom battery on contact 307 overbrush 301 and contact 308. Said relay (or relays) l corresponding to 128will be locked to common conductor 101' to close the conductor 218 ofthe concerned connector to the resting contact of its armature 136 toprepare for applying signaling current from source f through saidarmature 136 to the line seized by the connector. However, as the brush301 recedes, following the breaking of the energizing path of thesolenoid F in the manner set forth in the said cited patent toObergfell, the five lower contacts at the left will be successivelygrounded through the brush 301,.bar 302, spring 303, armature 304 toground. This willcause relays as f and f" to successively operate toapply the source f through armature (or armatures) corresponding to 135to the line called fromtheconne-ctor (or the respective connectors)having its re lay corresponding to 128 looked, as will ap- V pearpresently; It will appear presently that reference to Fig. 1, thetelephone T, lineswitch LS and first selector FS' upon a response beingobtained from a line called, thering cut-oil relay corresponding to 105will actuate and lock in the well known manner, incidentally opening thegrounded some'other connector, the plunger-rod operat- 130 i ing thebrush30l will continue reciprocating in: the'manner as set forth inthesaid cited patentvto Obergfell.v The relay 7 is connected to thefourth from the'bottom contact tacts 307 and 308' adapted to vbecoincidently engaged-by the brush 301 in: the v upward stroke. In thisconnection, it will be under stood that the other conta-cts'(310 forexample), lead toirelays as 7'' corresponding to relay f, respectively.The armature of relay f leads to a-set Of common. interchangingterminalsof adiiierent; connector bank level (not shown), connectedc'orrespondinglyto the conductor 312 leading from the armature of relayf; It will be-understood that the conductor 312 and othercorrespondingly situated 'conductorsof relays 9,, 7a., 2', f, and is mayserve any plurality of connector bank levels and cooperating connectors.For ex-:

ample, ifthe' installation "consists of five hundred connectors andrespectively 6001361- r l/ I at-ing banks, the relays f and 7 may eacnserve one-hundred connectors wherein thesig na-ling current willbeperiodicallyiapplied to the respective groups successively nf correspondence with the recession of the brush 301 over the contacts305 and310 in the mannerlset forth in the said patent to Qbergfelll- The upand-down reciprocation of the'brush 301 will continue'as long asconductor 101;is

applied to grounded battery by a connector 101. I I a a The signalingcurrent sources f, g, k, 2,7 and 7c are preferably alternating. current,

of the group commonly related toconductor though possibly pulsatingcurrent, for exfill ample; having a definitefrequency or periodicity forharmonica-11y selectively operating line signal bells-or other signaldevices. The respective frequency of the said sources f, g, h and i maybe conveniently assuniedas 16,33, 50 and 66 cycle. The sources 9' and ic'may be any said harmonic frequencies or they may. be of any type ofsuitable signaling current, respectively. However, it will benoticedthat while the relaysf, g, h and d are similarly connected'with relationto a single contact on their respective interrupter, the

relays j and 7c are multiply connected to a plurality of contacts ontheir respective interrupter. Inthe case of relay j it is con- Thesources f, g,h' and dare currents nected totwo narrow contacts, with awide contact nterspersed between the narrow contact-s. It will thusappear that asthe brush- 313 recedes, it will. cause the relay 9" toattractits armature briefly and'then prolongs Q ed'ly and then hrieflyi:This-' will cause short, long? and short application of source 3' toconductor 31%;111 the sameman-ner, five" short applications of source kwil-l'occurto conductor 315 ioreachrecession ot bru sh317.

The ten sets oiiniiie interchangingtermrnals correspond to the first tothe tenth banka contact positions of the level shown iniFig; 2, whichmaybe conveniently assumed to'be the first oft-normal level of thebank'of -pos-' sibly teir levels of bankterminals ofacon nector Aandassociatedgrou ofconnectors.

The numerical designations lto: 10): below the sets of terminals refertcthe; correspond-- ing numericalposition in the bank'leveliconcerned,there being a set of nine: interchanging terminals for each connectorbank -posi-i tioii. t will appear presently that the si=g= nalingconductor, as 319 to 328 may be inter changeahly connectedwith-.thearmat-ure of any relay 7', g, h, i", j andaJc. by. electricallytieing proper adjacentterminals of the set of terminals corresponding tothe'conductors 3'19Ito theset of terminals correspondingito theconducters 3191to; 328: This may bedon'e' by fiexing the ends of' thedesired t6III11-" 'nals into contact and applying solder thereto; Itwill be understood that any other method oi interchangeably connectingthe conductors 319 to. 328 and the conductors leading to the answer therequirements of the present 111- vention, such for example, asemploying'so called jumpers. i y I a ln Fig. 4, the ten sets or"- 'termiiials E atthe extreine leit are the correspond ngly designated tensets showniii Fig. 2',- and are numericallydesignated 1 -10 to index thecorresponding Jbanki position' in the banks B,

7G and D to v which they: multiply connect. Tlie'said sets 01 terminalsE'are located on the' intermediate distributing frame (designated D.-F.-in Fig; 4.), there being sets ofcable conductors extendiiigther'etofrom the cor-re spond ng sets of bank terminals" shown in" Fig. 'The'twosets of three terminals4t01- and 402 areona jumper branch block-on theI. D. F; The vertical row offiv'e' sets'of three terminals design'atedPare, located on the I. 'D. F. From each setvofterminals P a set of threecable conductors extend to a corresponding individual lineswitch 111thcated by a large circle. The two heavy lines leading to the lineswitchcsare talkingcon-' "ductors, while the light lineis the so-called privatenormal conductor; That is, the said heavy'lines correspond to conductors123 and 124, and the said lightline correspondsto conductor 50 o'fivFig.1 of the cited patent to latter said patent.

lineswitchemployed is vvnotlimited to the general type shown (designatedC) in the terminals onfthe correspondingterminal sets P and Q, on the I.D. F. and M. ,D. F., re

spectively, while the private normal conductor fromthe respective lineswitches terminate in a so-called .private? terminal on the I. D. F.companion to the: terminals of the corresponding talking conductors 9leading from the respective lineswitches.

The outsidesubscriber lines respectively lead-inby cable as a pair oftalking conduc- I tors and terminate in corresponding pairs of sc-called line terminals onthe. M. D. F. in

the well known manner. V The I. D. F. thus has a set of three terminals(two talking andone private normal) for each connector bank number inthe central ofiice, having inmind that each said number may be reachedthrough a plurality of permanently multipled bank terminals, possiblyten, three of which are shown in the levels designated B, C and Drespectively, in Fig. 2. The setof terminals E thus shows terminals of'ten connector bank lines belonging to a single level of ten line bankpositionsof a connector bank, which level, of course, may have. anyplurality of line bank positions (other than ten shown) per level andany plurality of levels; possibly ten levels. The

I. D. F. also has a number of so-called branchblocks-(as contain.terminal sets 401, and 402) normally 'disassociated. :The I. D. F.

further has a set of three terminals (two talking and one privatenormal) for each lineswitch of the. central ofiice, having in" mindthere is a corresponding set of arrester and heat-coil terminals on theM. D. F. for each said lineswitch and its said terminals on the ID. F. 1

The M. D. F. thus has a set of two talking so-called arrester terminalsfor each line switch of-the central oflice,and.-a -pair of.

talking so-called line terminals for and corresponding to each cablepair radiating from the central .ofiEice for subscriber use. The M. D.F. may also contain line terminals for other uses; such as inter-oflicetrunks, for example. However, the present invention is primarilydirected to the means for lnterconnecting inside or oflice subscriberequipment to subscribers lines, so auxiliary equip ment elements areomitted in order to simplify the disclosure.

'It will be noted herethat the temporary conductors or jumpers onthe'I.-D-. F. each constitute a set of three conductors, viz., twotalklng conductors and a prlvate' nor-- mal conductor. Also, that thejumpers on the M. D. F. each constitute two talking conductors only. Itwill, of course,be understoodthat while an I. D. F. and a M. D. F. havebeen referred to, a single cross-connectingframe may be employedembodying the elements described as located on the two said frames, andmoreover, the method used in carrying out the objects attained by thepresent invention may be modified as to cabling, jumpering, and therelative disposition and organization of the temporarily and per--manently associated elements without departing from the scope of theinvention as defined by the appended claims.

The general organization of the elements of the system contemplated inthe present invention having been set forth, detailed operation of thesystem in certain assumed calls will .be described.

Assume a call from telephone T to tele-v phone 105 (shown as a polarizedtelephone bell for simplicity) on individual line 1, the

telephone number of which is 1112. Upon initiating the call (by removingthe receiver) at telephone T, thelineswitch LS will operate and seizethe first selector (assumed to be thefirst idle one accessible), thelatter said selector being thereupon in condition to respond to thefirst digit 1directly transmitted from the calling device 110. Uponthecalling device 1101being operated, the selector FS will responsivelyoperate and select connector A (assumed to'be the first idle oneaccessible), in the well known manner, in view of the citation;

' In this connection, it will be understood thatin place of a singleselector. FS beingintermediate of the lineswitch LS and connector A,there may be two or more selectors adapted to be interlinked in tandem,de-A pending upon the numerical order capacity of the system. However,since employing a plurality ofselectors as'links ina tandemed connectionis not 'new in the art. the curtailed representation in Fig. 1 will beclearly understood as exemplary of the invention'in its application toexchanges of all subscriber and numerical order capacities theexa'mpled' system having three numer cal The connector A being wellknown inthe art, so far as the directive control elements thereof areconcerned, the operation of the line relay 112, release relay 113,series relay 11 1, vertical magnet VM,*off-normal spring set ON, privatemagnet (designated Priv. M.), side switches and 116, rotary magnet RM,busy relay 117, ringingrelay 120, ring cut-off relay 105, back-bridgerelay 122, release magnet (designated Rel.'M.),' will be fullyunderstood, and therefore need not fur-57564 bedetailedr Sufiice it tosay, however, that upon the shaft of connector Abeing operatedresponsive to the last two digits 12 of the called number, its wipers"211 to 214, in Fig.

2 will become setupon the second set of bank contacts of the bank levelD. Assuming the said called'line to. be idle, the relay 120 willactuate, in the well known manner, .and ground willbe applied throughsideswitch wiper 116, ccnductcr 124i, wiper 211, engaged bank contact,conductor 216,1. D. Luterminal 217, conductor ofjuinper 406,1. D 1

terminal 107, private normal cable conductor lcadingto the cut-off relayotthellneswitc'h 408. This will be effective tot-he saidline switch todisconnect or 'cut-oii the linerelay thereof from the talkingconductorsleading thereto, in the welllmown manner.

Consequent to the said actuation of relay 120, a circuit path can betraced from grounded battery, 'armatures 103, 102, conductor 101 y andthroughtlthe winding ot relay L- to' ground, the latter said :relayactuating- A circuit path can now be traced from grounded armature304150 the inultiple'dwindingsoil the solenoidsofthe interrupter devicesF, H, LJ and K. A circuit canialso be traced from grounded armature:330to the winding of the solenoid of interrupter G. The said interru'pt-erswill be thus caused tostart operating in the manner explained inrelation to inter- 1 rupter F. 1 w M 1 V i t will be noted that thesecond and third from the top) interchanging terminals of thesecond set(from the left) are electrlcally tied (by soldering, iorexample) so thata carcuit path can be traced from contact 331, armature of relay 9,common conductor 332,-tie 333,conductor 320, bank contact and wiper'212, conductor 218, make-before-break spring 126, winding of relay 128,armatures 129 and 130 to' ground. The relay 128 is designed (through theemployment-of a. core shield or otherwise) toha-ve the characteristic ofrelay 105 wherein it will-operate from sus-' tained direct 'current,.butwillbe nonopera tive to alternating current, or to brief appli-;

336 will operatively energize the. relay 128 over the'tracedpath. Alocking path torrelay 128 can now be tracedfrom spring 126, arinatures131, 102, 103'to 'groundedbattery,

the contact upon which spring 126 normallyv rests being now disengaged,The lower pin 337. on the plungerirod carryin brush 335 striking spring333 will disengage the spring upon which spring 338 normally rests andthe latter spring engages the spring shown above, so that the groundfrom armature .330 will now b'elapplied to the bar 339 and theenergizing path for the solenoid of interrupter Gr will bebroken-sothatthe brush 335 will start receding; its left-hand end'su ccessivelyengaging the contacts while "the right-hand time brush been stated withre-ferenceto relayj. =Duringthe time relay g is actuated, ringing current from source 9 Wlll he applied through armature of relayg, conductor332, tie 333, conductor -320,fbank contact and brush 212,. conductor218,;arrna'tures 135, 136, 137, con- .ductor 140, wiper1'213 and-engagedbank contact,;terminal 220, =talki ngconductorof jump,- er l06,terminal, 110, cable conductor 4:12, arrester terminal 413, lowerconductor of line 1, condenser and bell 405, upp'er line conductor,terminal e17, corresponding conductor'of ju1nperf4e15, arr-esterterminal 419,1Cabl cons end slidingly engages the bar 339. At'the 3'35engagescontact- 340, relay 9 will become energized inthe manner as has j.dllCtOifilQQ, terminal 121, corresponding conductor oi jumper 406,terminal. 223, arm'ae tures 1 12, 143, inner winding ct -relay 1105 togrounded'battery. The bell beingre sponsiveto thecurrent from source-gwill operate, while the'relay 105 will not oper- 'tively en'ergiZeflTheinterrupter device Gr will continue to. reciprocate its brush 335 aslong-I asi conductor 101 remains applied to grounded battery, anapplication ofthe source .9 over the traced path including bell 405cccurringeach time the brush335 engages con-- its attraction, becauseofbar 33'9 being*dead under 'thef'attracting condition as spring 338 isthenaresting-as shown in the drawing.

- In this-connection, attentionis directed to y the fact that if relay120 inconnector A actuates after brush 335 has left-bank contact 331 inreceding (common conductor 101 having beenbetore applied togroundedbattely by some other connector of the-group containingconnector. A) the actuation of relay 9 W111 have no operativeyeffect onthe bell 405, due

to relay 12 8 beingnormal, though relay jg may'apply currentfromfsourcej g to another bell through a connectorof its group havingoperatively seized a line before brush .335 left contact 331 in itsdownward stroke in the manner described. Under the last statedcondition, signaling current from source g will findits way over thetraced path includingthewinding of relay128 to 'grounded'armature 130,but clue to the stated characteristic of relay .128 it {willnot-operatively respond to-thesignaling current source g,orother sig-.nahng-current source,.-such as f, h, i, y and 7c. The resistanceofrelay 128 is preferably high, so that it-willnot abstract an objectact340: during its recession, :bllt not during .tionable drain ofsignalingcurrent from the applied source, and moreover, the groundpathf'strom armature may include a retardaticn coil (not shown) commonto all the connectQrsfof-thegroup containingconnector A to further baror suppress the signaling current from the source being applied.

- Upon a response being obtained on the called lineby the removal of thereceiver from the switchhook of the telephone indicated by bell 405, aconductive path will be closed including grounded signaling currentsource and the inner winding of relay105, causing it (relay' 10,5) toactuate and look its outer winding through armature 145- to groundedlower off-normal spring, incidentally grounding theuppe'r terminal ofthe lower winding ofback-bridge relay 122. I Relay 122: will actuate inthe well known manner and arma ture 103 will-remove groundedbattery'from conductor 101,having in mind conductor 101 may remainapplied to 'battery'ironi some other connector armature corresponding to103. Due to the armature1 attracting. the,

relay 128 will become unlockedjregardless of the state of conductorlOl.The'relay 122 will operatively energize'through armatures 136 and143 andthe traced pathincluding the receiver of telephone on line 1.- Thecalling and called telephones are now in talking connection. "Therestorationof the; COI1118C,

, tor concerns'well known circuit paths and though" if non-har1nonic,,itmay be univere elements and therefore need not be detailed in impartinga clear disclosure.

Assume that-in the described call the tie 333 is transferredorinterchanged to the fourth and fifthterminals in lieu of the secondand third as shown. The source it will be applied by relay h in lieu ofsource 9 by relay 9. In the present assumed case, the bell 405 willrequire changing, provided it was selectively responsive to the source9,

sally responsive to the signal current, and therefore responsive to the"current from source b;

v Assume that the tie 333' is interchanged to g conductor.315,thepresentassumed tie, conbetween the two-terminals lowermost, inlieu ofthe second and third,-as shown in the drawing. The source 71; will beapplied by relay k in lieu of source 9 by relay 9. In'this connection,it will be noted that while the topmost left-hand terminal 341engageable to brush 317 leads to'the resting contactofthearmatureofrelay it and thecorresponding V right-hand contact 342 leadsto grounded battery, simulating the arrangement of the interrupter G,the winding of relay lcfism ultipled to the five contacts consecutivelybelow contact34l, Thus, as the brush 317 recedes after its lower pm 343engages and operates the spring 344, the ground from armature 304 willbe applied throughspring 344,'bar 346, brush'317 to the successivelyengaged contacts below contact 341, efl?ect ivet0 vibrate thearmature'ofrelay five times, therebycorrespondingly applying anddisconnecting the signal current source with respect 1 to ductor 320 andover the before tracedpath to to its stated design. Upon the brush 317beground at armature 130 if it is assumed that the concerned connectorrelay-120 actuated-- after brush 317 receded from contacts 341 and 342.However, the relay 128 willnot be operatively afi'ected by the saidcurrent, due

ing next moved into engagement with contacts 341 and 342, the groundedbattery at contact 342 will be applied through the armature of relay 70and over the traced path includingthe winding of relay 128 to groundedVarmature'l30, causing relay 128 to actuate and look, as described. Thiswill prepare the signaliligcircuit at armature 135, so when the recedingbrush 317 successively grounds the contacts attached to the winding ofrelay current, from sourcelc, a code of five bells, j

so-called, willensue. Ittis thus clear that since the brush 317 mustengage contacts 341 g and 342, in orderto close the signaling circuit aat armature 135 it will be impossible to initi-, I

ate the application of code signaling current from any'connector at anyperiod other than the initial period of the code. And it will also a ibe clear that regardless of the numberot con-' nectorsflsimila-rlyrelated for signaling with reference to the interrupter device, therespective connectors will remain disabled from i applying signalingcurrent-until the first engagement of brush 317 with contacts 341 and342 after the seizure of the concerned connec tor by the actuation ofits relay corresponding to relay 120 to complete the ground path fromthelower winding'terininal of the relay therein correspondingto relay128. The removal of grounded battery irom conductor 101 bythe attractionof armature 103 will de loo 1 energize relay L,consequent tothe-response onthe called line, as before described,having in mind thatconductor 101 may be maintained to grounded battery by another contheseventh" and eighth terminals in lieu of the second and third,- as shown.The source j will'become'related to conductor 320 as was source 70 intlieilast assumeddescription. The

relay '7" has thesame dispositionand function with relation totheinterrupterJ as relay is has to interrupterK, having in inind'that thecontact 348 .coversthe space, of three spaced contacts of interrupter KThus,as the brush 313 recedes the relay 7": Will be caused to atv i i Vtract its armature for a relatively long period:

intermediate of two short attracted periodsi 1 l Thiswill effect a codesignal constituted of a V 110;. nector in seizedrelation whichhas notbeen j respondedto from its called line, though the v 1 i short, longand short bell to the called line. The function andobject of thecontacts'352 and'353 corre'spondto that ofthe contacts 341*and 342. o

' It'is thought that the foregoing makes clear thefunctionii'ig oi theconnectors and'the interrupter devices shown, having in mind there 7 maybe anydesired plurality of signaling current sources or codes; onlybeing shown for the purpose of illustration;

- The employment of the devices of the sys- I tenrwherein' party' linesare concerned will a 421' and 422 as apart oflthe concerned tele phones(not detailed), selectively responsive" to 16 cycles and 50 cycles,respectively," It

, bedis'cussed The party lines may have the i respective stationsthereon signaled selective lyharmonioally or alternatively by code, orthe signalinginayibe both harmonic and code,

as will appear.

Line 2-- has tw o harn' onic signal devices will be noted that a'jumper425 is run corresponding to jumper 415 Since the outside cableconductors and the main franieelements are adapted tounive'rsaluse; thatis,

yibe employedin individual line or in party line servicethey will besimilarly, jUPIP- I ered on the MJDQ F. under either use. I-iowe ver,theline 21s a party line, havingtwo selectively s gnaled subscribersstations thereon, and the fact that thestation thereon designated 421 isreached by calling telephone number 1115 wherein -16-c cle si nallina'.

i J a t current is impressed from source f and the station designated422 is reached by calling telephone number 1117 wherein -cyclesignaliii'gcurrent is impressed from source 7i: In'orderthat thesignaling characteristic of each of the telephone signals 421 and-422,

' andalsothe calling numbersof the saidtelephonesmaybe singly orbothchaiiged (in reg grouping," for example) without disturbir'igthetWo-conductor umper 425 and the -un-' concerned tli'ree concliictorotherjuinper, a

ranch-block terniinal'set 101 is arbitrarily chosen towvh'ich'to runthethreeeconductor jumper 427; The branch-block 401 may have its threeterminals arranged in nultipled gaiigs respectively", wherein whencorrea spending sets of lugs of the terminals are distinctively set.apart for'each current char acter it enables the junctioned jumpers fromthe'connector bank terminal sets to be 'attached thereto to beidentified with respect to the subscribers' stations to' which eachjumper refers. However, the'latter referred to convenience is a detailedfeature. It will now be clear that when jumpers 29 and 430 are runtotlie fitthand seventh setsoff terminals ofthe level group E, the'line2 may be reached by setting the wipers 211 to 214 0:5 connector A"-uponeitherthe fifth or the seventh set ot banlecontacts ofthe bank levelgroup D, or the line "2' may be reachedirom the corresponding positionedbank Contact sets inlevel groups B and C, as well as from othermultipled' level groups tlier eoit',v not shown, Also, it'will' be clearthat "theplacing ofth'e tie onea'ch' tlie'fi'fth and seventh setofinterchanging terminals shown 1' in' Fig 8 will determine whatspecific sourceo'f signah ing current will'be impressed by the connectorwhen seizing the line '2'from either" of its said two branches in Thedrawings" show theo first aiid' secondf' terminals of the fifth set" ofthe signaling current terminals tied 'by tie 355, and the". fifth andsixthiset of'the seventh set tied by tie 556." Thus,whenaconne'ctorseizes the I p from source f will be impressed uponthe 'line fifth setof bank terminals, l6 -cycle' current 2(and when a'connector seizes theseventh set" of bank termina'ls 50-cy'cle current troin source h will beimpressedupon the line From; what has been #described, it 'is] clearthat changing either or both the ties 355 and 85.6, will enable thesource-"to beiiiip'ressed to the line 2iover the jumper; branches 4 29and 30 to be changedat'wilhhavingin mind that theb'ellsor signal deviceson the line 2' will be changed to be responsive to the applied source.Further, the jumpers l29 and 430"" may beindependently' changed from oneset of bank terminals of the connector bank group to another, orto anyother'bank group (not shown) ofthe central office. The'latter would bedone if a change or re g rouping of subscribers were desired; the umpersbeing run to the connecto'rfbank numbers cor-responding to the telephonenumbers-of the subscribers connected onthe line. Of course, w

the bells 421 and 422will be differently se',- lectively responsive V toavoid confusion, but

there is no definite signalingcurrent' charmaybe changed asand whendesired, by al subscriber havingtelephone number 1118"? for the onehaving-telephone number 1115', the latter subscriber discontinuinghisservice,

or perhaps being groupedwith subscribers onsome other lin'e. The jumper429 will be transferred to the corresponding terminals'ot the'eighth setofthe level group E and the.

bell l21 displacedby albell responsive to any available sourceothertha'ii 50-cycle employed to operate bell 4 22. Assume this chosenbell'is responsive to 66 cycle current, perhapsbecause the subscribersbell formerly-responded to-thissignaliiig current frequency, andtherefore employing the same bell will obviate changing histelephonem'In this event a tie 358 will bemadebetweeii. the fifth andsixth interchanging terminals ofthe eighthset,

connecting conductor 326 "to the armature of relay iwhereirfthelattersaid relay is-operated by interrupter I.in the mannermade clear in foregolng descrlptlons.

The subscribers .telephone421 disconnected fro-m the line 2, thetelephone number of which is 1115, may now be attached to any suitableoutside line having subscriber V3,: cancy. A jumperwill be run from thefifth set of terminals of level group E (being connector bank numberF1115-belonging. perbranch-block corresponding to 401 or 402, for

example, associated with the line to which the I telephone 421 istransferred. y In this" connec tion it will benoted that if the line towhich ther than the said running'of the frame j umper- (retaining tie355,) will be necessary after line. But if thenew'line already has asignal device (and code) which is like that of the:

changed telephone 421, any signal current (or code) different fromfthoseused will. be chosen, and the tie 3555 changed accordingly; whichcompletes the re-grouping, having in mind that the signal device of thetelephone will have to be changedto correspond to the 355 is notretained as shownin the drawing. It will be understood that in case the;telephone 421iis' to be on an'individual line, the

a new jumper run from the fifth set of termi- V v nals ofthe group-Ewill be run tora vacant set of terminalsas 468,-forexample, and asec-- .ond' jumper will be run from terminals 467 to a set of outsideline terminals of the group containing the terminals of lines 1 to 4,but

not shown, upon which the'said individual line terminates. Under thelatter assumed conditionincoming calls will be extended 7 throughthelineswitch 465', while outgoing calls will be extended over the jumperat tached to'the said fifth set of terminals of the group E,'as when thetelephone 421 was on the The bells 421 and 422 on line 2 are operatedby16-cycle and -cycle current, respectively; If it is assumed'that asubscriber having telephone number 1'118 be connected toasaid in Fig.2will not exist and aItie will be placed between the lower two terminalsof theeighth group in Fig. 3. 'Thiswillconnect conductor 315 toconductor326 so that when the eighth thereof) theline 2 will be signaledjuponfrom the source; 71: whereby a code offfiv'e fbells; willoccur tothen'ewly added; telephone (not:

manently to the concernedsubscriber) to the the latter saidtelephone421' is transferred has no signalcurrent-(16}cycle) associated therewithto cause confusion, nofchange :furv changing the telephone from line2eto the-new;

impressed signalingcurrent, in case the ties'et of'bankcontacts areseized by wiper set 211to 214 (or any other'set'of'wipers havingaccess'to a multipled bankficontact set shown) and also to the bellv 422. Thesub-;

scriber having bell 422awill ignore the five bells while the newly addedsubscriber will respond wherein the concerned connector will function ashas been set forth upon a response occurring. Regardless ofthe positionof brush a 317 when the connector seizesthe line 2 the signaling currentfromthe seizingconnector will not be initiateduntilbrush 317 hasencoun-' tered contacts 341 and 344 andhasireceded to :the firstsuccessive contact in the manner as has been set forth indescriptionsowith rela tion to connector A. When the line is seized by aconnectoroverthev branch including the jumper 430 wherein thesource itwill be a a r P '80; plied to the connector through the tie 356the bell422 andthe bell of said newly added telev phone willoperate, but ascodes of one hell will be now applied by the seizing connector v thenewly connected subscriber will ignore the signal. It will be-jmanifestin view of the descriptions, that in lieu of tieing the lowergtwoterminals ofthe eighth set in'Fig. 3, the seventh and eighth terminalsthereof may be tied so in that event a short-long-shortcode of'33 cycleswill be applied from source 7' by. the connector seizing bank 1118, i Inthis case, no hell on line 2 would respond, unless the bell of thenewlyadded telephone were maderesponsive 'to 33 cycle current, which, ofcourse, would have to be done to establish thesaid new subscriber inservice.

of the subscribers on the line'2 upon; initiating a callwill causetheassociated lineswitch 435 to functionand extend the call to a firstselector as inthe case ofthe call initiated r from telephone T, Theprivate normalcon ductorwill then applygroundtothe private normalconductor ofithe jumper 427, and over the private normal conductorsofthejumpers (as 429 and430) branching fromthe branchblock terminalsetf401 to the connector-banks correspondmgto the associated telephone.

numbers toguard theline against intrusion by aconnectorover anyof 1tscentral ofiice branches. As the private normal conductors V of'thecentral ofiice branches of the line 2 are mutually otied,'when anysaid'branch is seized by a connector, all thelbranches are simul-'taneously guarded against intrusion by a connector, as well asoperatingthe lineswitch cut-ofl relay. e I The branch-block 444,whichlead from the first, third, sixth and tenth set ofterminals ofconnector bank group B, respectively, so the line3 may be reached. eover the said branches and jumpers 445 and 446 by callingtelephone'numbers 1111, 1113, 1116 and 1110, respectively. The

line 3-has telephonebells 451 to 454 thereon selectively responsive to16p-cycle, 50-cycle, 33-

cycle and 66-cycle signaling current, respec- 402 serves to junction thel corresponding conductors of jumpers 441 to r tively. Due to. ties 361to 364 corresponding 1 V t the j mpers 441't squr 'f h.

and i will be applied selectively eflective to the bells 451 to lhWll6I1any of telephone called, respectively.

The disposition ofthelineswitch 461 Withrespect to line 3 and accessiblefirst selectors it and theccnnector bank branches reached over pinipersL11 and t ll corresponds to the re:

lationship of lineswitch- 4:35, line'2 and its 0 connect-orbank branchesreached over Jumpv .ers 4-29-and $30. It will be clear thattheresponsive characteristics of the bells on line 3 maybe changed Withoutservice confusion by correspondingly altering the ties'oni the con-- 15cerne'd interchanging set corresponding to the concerned teiephcnenumber funthermone,

changing terminals corresponding to those in Fig; 3) will be tied toadapt the connector seizing any said line branch to apply s1gnalingcurrent to selectively operate encode the corresponding telephone bell:on the outside,

g line; It Will-be clear, fore-Xaniple, that changing the tie 361-to tiethe ninth and tenthter-v contacts of the level :(responsi-veto callingtelephone number 1111 to projecta code of five fbel'ls?" of '50-cyclecurrent. over the.

V jumper efiectivei-o bell 453 fin l u of one ell of 16-cycles itotchan-ge-the connection oi the telephone 40 from the one to the othersaldline and trans 402 1 cv corresponding lugs on, the branch ,ter:

minal set eQl. 1Anew telephoneg thevbell of which isnet responsive toany; of the" em plcyedcyclcs one-line 3 maybe connected thereon to i:ei)lacetl1e l-i; e vacancy madefby the transferring of the telephonerepresented i by bell 452, and a jnmperlike' l l3run from selectiuelysignal the other; subscribers or a subscriber ion :the line3,ebu t ineache ent a new code fronrthatthenemployed on line 3 Willaiecessarily bechosen for then wly added telephonevtoforestall-confusion. --,Tvvo; ofthe signalingcurrent interchanging terminals of r the connector banknumber; of" the saidnew: telephone will be tied to adapt i any;connector seizingthe linefi through the; latterv said cone nector banknumber to project signaling cur rent from. the proper sourcetoselectively sig 7 nalthesubscribercorresponding' a adaptedto projectcurrent from source 7c if in view o'ti'oregoing descriptions, 'itvvillbe manifest that if itzxis desired-to. change the telephone representedby ,Ebel li A52 from 1 the. line 3 to the line 2, all that. willibeyrequired 1S terj u mper 443; from the branch-terminal set vention.In commercial The lineswitch 465 is dead, being cabled to 'arrester4:67, the cable sets to the lineswitch 4:65 and to the arresterr 467having the talking conductors tiedmultiply at the terminal set 468; i

The line lhastelephone bells 471 and 47-2- responsive to 33 and 50cycles; respectively, The line a is: connected-over jumper 470 to anarrester and corresponding linesvvitch 471 on i the M. D.F.;Jumper'branch'es $73 and 474 from the lineswitch terminals on the M; D.F.

lead to the fourth and ninth terminal sets of level groupv Es vThesejumper-s 473 and 474 therefore correspond to telephone numbers 1114. and1119?, respectively. Due-to the :placing of the mean and 372, theseizingconnector will be adapted to project current from source j if thebranch including jumper 47 3 is seized whereby the bell 47 1 will beoperated," and the seizing connector Willbe the branchlinclu'ding jumper474 is seized whereby bell 472ivill be operated. In the case of applyingsource j, a code consisting of a short-long-short series oi bells? willensue; each code always being initiatedat its.

plained, Ina comprehensive,. commercial beginning in'the manner as hasbeenveX- urinals inlieuof the firstVand'r-second, W111 adapt a connectorseizing the hrst set ofbanlr systeinthere would ordinarily be agreaternumber of code "combinations-than shoavn,.but the, method ofapplyingthern alternatively to any line Willbe ashas beenset" forth.In'i-nstances, all of the-sources mayybe code, con-v sisting of apluralityiof ibells ion a signal. It will be manifest that theme-372 maybe changed from the. eighth and ninth terminals to any other acent onesby correspondingly changing therbe'll 472 to be responsivev to I thechanged signal-current source asses ciated with thebranch includingjumper 4574.

However, it the said tie is changed to the third and fourth, terminals,50-cyc-le currentwill be then adapted to be p rojected from source 71through-a connectonseizi-ng -.tl1e branch'includingfjumper 4 74, so thebell 472 will be operative to the periodic nonecode applications. r v V"The jumpers 4T 3 and 47% run directly to the terininals of linesivitch.471, in lieu; of through branch terminal set of the type of 401,! for,example; thus obviating the employment of ajuinpercorresponding to 427,for example,

though it Willjbe' clear, such an intermediate bra-nch terminal set maybe employed if dc-L s1 red,.s1nce.the1 system admits of variation.withoutdeparting from the scope otthe inoperation, certain. divisionsofthe arrester terminals on-the M. D. F. mayv be set as deIfor'l'inesof-the different ,classi-fie.

cations. Thiswwillmeanthatxthe lineswitch terminals 'OIlQlllB; 1. 1);will: be correspond: ingly segregated. 1 Itwillthus. be iound con:

venienttandinfacfiit iscontemplatediin, the 1 present invention) to-iusegang-terminals for tliereserved 011 diiferent plurality classes of partylines, so that the jumpersffrom the connector. bank terminals .mayjunction at the I. D. F. lineswitch terminal. set concerned. This, forexample, will obviate the jumper as 445 and the branch terminal set 402,since thejumpersll to 444 wouldallrun directly to the gang-terminals of.the lineswitch 4:61. Theijiumpers 47 3 and i 474 arerun in the'mannerlast set forth.

There would not-necessarily beany segregation as'to classes intheconnector blanks. On the other hand, the diversifyingof theclassifications in the connector 'banks promotes making the coincidenttrailic uniform in the various groups at all times of the day, as thetraffic. characteristicslof, the diverse classifications constitutingthe :groups will-intermesh.

- The more uniformly the groups are diversifield as to classificationaofjthe. subscribers reached therethrough, the: more uniform "will be the 1coincident trafiic' in the connectorv groups of the central otlice, thusrequiring the minimu'm of connectors for a stated trafiic for thecentral oiiice. The present inifzentlon lends itself as one of 1tsob]ects, to promote the Said.

diversifying of the traffic amongthe connectors of the central office. a

- The illustrative crossrconnectionshave concerned a single level of aconnector bank group, but it will be understood that this method hasbeenused as it appeared the sim plest manner of disclosing thecomprehensive system contemplated, and itso'peration. The

system contemplates that eachlevel of a plurality of multi-level (orsingle level) bank groups will be arranged asshown in Figs 2 and3wherein all'the bank groups terminate on the LD. F. forcross-connectionwith the conductors of any level o r;-levels of the saidpluralityand with: the desired subscribers line, wherein interchangeablecentral oiiicev branches from a subscribers line may terminate intowidely separated goonnector bank groups not having des gned permanentrelation..

It :will appear, infview of the descriptions,.that I have. provided,amongother functions, a system of assembling cen tral' olfice equipmentelements of well known type and also of equipmentielements of thepresent inventiom'with outside subscribers lines wherein changes ofgroupings of party subscribers may be made without changing callingnumbers of the concerned subscribers, regardless of the type and kind ofsignaling current it is found convenient to employ from time to'time forthe bells, with due regard to selective calling. The invention alsoprovides for keeping party lines-filled to operating capacity, becausein the event of disconnecting a telephone, anew telephone havinganydesired telephone number, may replace it.

' Moreoveig the said added telephone'may be responsive to anyavailablesignaling characteristic, and then changed fromtime to time withoutchanging the calling number.

The system of the presentinvention thus lends itself to re-groupingsubscriber lines from time to time toconform to the most economicaltreatment of the outside plant as regardsparty line grouping. It alsocon duces to the employment'of the lineswitches j to their fullest partycapacity, because when a disconnection of'serviceis made with referenceto any party line, the connector bank branch or number concerned, andnotrany fraction of the lineswitchrapacity of the. central o ifice, isthe only portion of the central ofiice equipment taken out of earningservice until the disconnectedisubscribers num her is omitted from thesubscriber directory, Thisalso applies when an individual subs scriberchanges to a partyrline classification I or whenhediscontinues'hisservice. In the case of disconnecting theservice, the cone nector banknumber is thefonlyelementof the central' .oflice equipment retained outof;

revenueservice, and the latter is only so retained until the Tdisconnected subscribers number is omitted from the subscriber direc-.tory'. The said connector bank number. or. branch representsarelatively" small capital investment as compared to the lineswitch capacity which would be lost were not some method, suchas is provided inthe present system, provided to reinstate the lineswitch idlenessforthwith after such idleness occurs;

of a plurality of accessible called subscriber V lines or branches ofsuch consequent upon seizing the called line or branch-without the" nnecessity of the calling subscriber performing a specific signalingcurrent selecting operation; seizing-the called line o'r branch ofthecalled line determines the character of the code of'signaling currentto be applied direct- .ly from theconnector wherein but one characterofsignaling current is then present in the connector. And, moreover, thatthe said I one character'of current present inthe connector cannot beapplied from the connector excepting at'apre-determined time ofthe operativeness :of'the current *or code; That is,

the character and codeof-thesignaling cun rent received and impressed bytheconnector is determined by'and merely incidental to the selectivesetting oftheconnector with respect to connecting with theterminalsof'theicalled 11119;". i i. .1 u I Q .V Again, the systemoperates .to obviate numscribers, and where changing the type of sig-"'ber changingwhen; re-groupingparty subs 7 may become large itemtro fexpense to -the e t ng" curren 10.1 the-ce e l ere f i 1Si i9l for anyreso hengleg nu e l -annqy;

ing to the subscribers and the records [o fueh operating concerninourrex ltly same and in giving thie information to its ubs b r wh aling e a ge members The latter is aside from the idle traific yee ing sus ib ns t i bfiain an d- 1 h i me iqna d the nnoyenqe esioned to thegelling 1 110slcr ibere in obtaining e chang nf rma i n I claim:

;;1. In a telephone system, in vcormegfpor witch; line bankxmntaets' for.thegcoml'e tor,

sigrraling contacts Ifor the connector correspondingrto vthe l necontacts, ap l 1,1-

al ty' Of -ru i difie oen sign l e em:

rents, line and signaling Wipers for thereonnn t ng said s r s 01 n incurren and the bank s1gna-1 1 1 1g contacts, aronpec tion extending from.the signa l i ngWiper to, a llne Wiper for conductingrslgnelmg current.to

from the se e d"b ks gn "ce eet l szud hne wlper, telephonellnes and asecond conpecting {rack ifor;interehairgegthly connecting said lines andline eontaets.

:Q-"In a telephone. ys e e .mnewr swlteh, line ban}; coz ltgrcts gi'orthe corrlglector,

sig igal ing cozgtacfis for the qom ieotor balgrkeorresponcllogitotheiline contaets, a of soureespf rd l fierent ergnwhng .cu-rrel tts,

line and signaling wipers magne cohnejetox,

a, connecting rack vfor interchangeably connectnrg sold sourcesof-sLgpal-mg current and, the bank slgnahng .contzgc-ts, ,1 eon-neotlopXf tending from the signaling viper to it line \ylper for conductrngrslglrgtlrrrg current from the selectec t bapk signaling conta-et tosaid Line Wiper signaling correrrt i rlterrupter means lncluded 1n the sgnahngteurrept path telephelie lines, and a second connectingsmek. 1

for intergh angeablyreorrneeting said litres and hne contacts. v

3. In a telephogee system, Q 00vnr1eetor switch; line bank coritacteforthe cmmeetqi,

sgrre1ing contacts for the connector bgrik com'espondin g to the linecont acts, .2 plurality of sources of difierent signalingiegrreagts meand sign aling wipers for $118 icomiec t connecting rick for,interchangeably connect-1 ting said Sourcesifof Signaling ourrentiandthe bank signuli lig contacts; 21 conrlectiorg extend "izig" from thesignaling" wiper to it linewiper 7 emichicting signaling eurrerit from see-ted. bank signaling. .c 011t aet to {said 'ne wiper isigrialijrgcurrent ifit errrIpterfiritr posed between the sources of rsignglinglourrent and the first saideopeecti ng rac k,vtelfe.- phone lines,and aseeond eonnectinjg rack for iritercharigeably connecting said lines3nd line contacts. V

4:. In a telephone system, eonnector w he having m i tipl 'Q nee ibeek lh in gira pa ylinto i ig' ldeyices (fie-B1 edlthere e, ee

coiniijec fed hank l ne-teon tae ank I ie he -i 12 Ply-relive? e9 eri et l e eee {lines hevillg' eelepme is gn ing fieviees -gbfnneeted. theeto, ga

c gn egjfi ip r'aek jfar interchailgeably ,iconne fi. ou l y hides 6,bank Q lEKitsQ-if$ e0 1ii tors lt 'hes; $9 lr'ce Qfl re pending-i ih ilne pal ibankmslgrl glqwitaslefl t h connector switchesorrespontliii "tothe'jba-I tk inete9ntactsranphmeensi n-i jl opt l ct pg the -,gs:ou lige "-.of sign ng @m'ren? 1n,- t it en e l m-ml t ng a pa ty t m 2 e r -yi z lel ecto rcqhte ts f'the-samed it t "g -t p -.5QL11CS ofsignalingrburfi n -tol h s le t y i -n aling h i' c s 011.1" the rcon'iec o switches co'rrepondirig to the line Qontaets,

e m e iet he eee ly o t n th e- SQUEQQS ,qfj sigr ralin currerit to ,thegs i gt group sf f t n- I watc e eeeh te 3 7 fa it plurality of mi y-tphol lines, plurality of tcQrmec- .7 -beek ign ng e i t i 'e e ee\Wlththe seleotlyesrgnal e -ewi r i s-hz ving b nk i ie-s i ta ts,means,

forjrnterelrarigeaihlypolgneetings aidlil es and, a p umber of eon t agts .Q "the connector p o flp l il flmd,iildep ldfil t o anypred t m n dinumeriq r l ol O the @Q e ts, s ur es E i" signaling c'urrent e 1"(indigg to Ltheteleloihones bn thepanty line's, ign l ng cu ren ,bik-lqonta s "cprrespon ing-to the; me-e m'ct s, arid means. forintertorswit hest aehg eup hev mgmultiplysonnested bit-I ll;

eeideviee r ne t r h e e e mlec ie i awe switches eorrespoildi, fltoltliejlilllriber ,oftelef signals on any line.

difiei tfgrtups', soureesjof signaling current V corresponding'totheselective signals, signal-' ingfcurrent bank-contacts equal in number tothe'line contacts and corresponding thereto,

' and f means for interchangeably connecting the sources of signalingcurrent to the signaling contacts to correspond w th the selective 9.- 1a telephone system,groups of connector switches each group havingmultiply con nected bank line-contacts, party telephone lines havinginterchangeable selective signaling devices connected thereto, signalingcurrent bank contacts equal in number to the line contacts andcorresponding thereto, 1 means for interchangeably connecting apartyline to a plurality of connector "contacts of the sameorditferentgroups, sourcesotfsignaling current correspondingto theselective signals, and means for interchangeably connecting the sourcesotsignaling current to the signal ing contacts to correspond with tlieselective signalsio'n anyline.

'10. Infaj telephone system, [a connector switch having sets of bankcontacts each in a cludingfa line contact and a cerresponding signalingcontact, line "and signaling wipersfor tl ej connector, a pluralityotsources of difl'erent signaling currents, a connect ng rack I forinterchangeably" connecting said sources er signaling currents. an d thebank signaling contacts, telephone; lines each having one or moretelephones'and interchange able; signal"-devicescorresponding tothe'differe'nt -,signalingpcurrents, a second connect ingracl: forinterchangeablyconnecting said lines and one orjrnore sets of the linecontacts I indiscriminately, whereby 'said telephones may be changedfrom one line' to any other withoutchanging their calling numbers.-

j 1 1. In 'a telephonesystem, groups of connector switches each grouphaving multiply, connected bank, line contacts, party telephone lineshavinginterchangeable selective signal iho l i ma seized in attainingconnection with the linefor adapting a predetermined one of said sourcesof signaling currentrto'be projectedover the line, and meansforinterchangeably connecting the sources ofsignaling currentto correspondi vith the bank line contacts and" the corresponding select ve "signalson any line. t

12. In a telephone systeni, 1 a plurality of party'telephone lines, aplurality-of connector. switches having bank line contacts,n1eans forinterchangeably connecting 7 said "lines and a number of contactsontheconnector switches corresponding to the nuinber oftelephones onaline and independent of any' predetermined numerical relation of thecontacts, sources of signaling current corresponding to the teleitphones on the party-lines, means controlled" depending upon theibankline contact seized in attaining connection with; the line for adaptinga predetermined one of said sources of signaling current to beprojectedover the line, and means for interchangeably connect f ing thesources of signaling current to corre-.* spond with thefbank' linecontacts and the cor- 1 responding selective signals on any line. a

13, Ina telephone system-a line, a connec tor switcln linebank terminalsfor theconnector, branches of the line extending to a pluralityof thesaid terminals, a plurality-of sources of'signaling current,"1neans foriinpressing a said source of signaling current upon the-lineforoperating a selective signal device thereon "dependent upon 'What line'-branch" bankIterminalis seized by" the connector, a connecting rack "forinterchangeably connecting sa d sources of signaling current,

and means i for interchangeably connecting the said branches tocorrespond with the related signaling current sources and the saidsignal devices on thelinej I 14. In a'telephone system, a connectorswitch, line bankcontacts Itor'the connector,

signaling contacts for the connector bank cor responding to the linecontacts, a plurality of sources of different signaling currents, lineand signaling'Wipersffor theConnector, a connectingrack forinterchangeably connect ing said sources of signaling current andthebank signal ng contacts, a connection extend ing from the signalingwiperto'a line-Wiper for conducting signaling current from the 'selectedbank signaling contact to said line:

ice I wiper, interrupter ineans included in the sig naling current pathforcontrolling theappl cat-ion of signal ng current in successive trainsof series, and means controlled by the said interrupter whereby theapplication of any portion of'a'train ofseries-Will be'disabled frombeing initially applied after the interrupter has started thefapplicationfof a 1 5JIn' a telephone system ya; connector W switch,line bank contacts for the connector,

si naling contacts for thefconnector bank corresponding to the linecontacts, a plurality ot'sourcesot difi'erent signaling currents,'line'andsignaling Wipers for the connector, a connecting rack 'forinterchangeably connecti i -12 bank signaling contacts, a connectionextend- 1 ing said sources of signaling current andthe ing from thesignaling Wiper to thelin'e Wiper.

for conducting signaling current from the selected'bank signalingcontact to said line iper, interrupter neans included in the signalingcurrent path for controlling the application of signaling current in'successive.

trains of series, means controlled by-the said interrupter wherebythegapplication of any portion of asaid tr'ainiot series will-be dis l laccessible from the connector, a source of mg- I a Specificsairl'character will be applied to'the called line depending upon whichbranchv of the calledline is connectedgwith.

: connector, a signaling current source for ap- 'plication to thecalledline from the connector,

a relay opcrated forclosingacircuit path between the signaling'curre'gntsource andthe connector, and aconduc-tojr individualto thecalledfl'llnencluded 1n said CllCUltpath between the source and the connector/overwhich said relay isf' op'erativelyenergized.

24.'In an automatic" telephone system, a directivelycontrolled'connector, a called line naling V current ihavingintermittently live pe-.

I, riods ,for application to the, called line from the connectonan'elayoperated for closing ato the called line for applicationto thecalledcircuit path betwc en the signaling current source and thenconnectorincluded in said circuit path between the source and the corn nectorover which said relay is operatively energized, andmeans the operationof which is non-directively initiated after the connector has beenoperated intoconnection with the called line for causing the-operationof therelay only at a predetermined time with respect to the liveperiods of the signaling current source; a v

25, In an automatic connector, a called l ne accessible from p theconnector, a signaling; current source specific line from the connector,arelay operated fer thercalled ;line-included,in said circuit path rbetweenthe sourceiandgthe connector over which said relay is cperativelyenergized.

26. In an automatic telephone system, a

connector, a plurality of called lines accessible from the connector,signahng current sources spccific tothe respectivecalled lines forapplication to the line called from theconnector,

a relay operated for closing a circuit 'path between the signalingcurrent source and the "connector including a wiper of the connector.and'a terminal of the selected called line,

and aconduc-tor individual to the called line included in said circuitpath between the;

"said r V p 4 I 31'.;In anautomatic telephone system. a

connector, a plurality of called lines accessible .from theconnector, asource of signaling cursource and the connector over which relay isoperativelyenergized; s V

1 called lines accessible';:from 1 the connector, sourcesofsignahngcurrent spec1fic;;tothe respective calle dl lines havingintermittent live periods for application to the linecalledf 1 fromitheconnector, a relayoperated for closk ing a circuit path between thesignaling current source'and the connector including a wiper oftlieconnector and a non-talking terin sai'clccircuit path betweenthesourccand .the. connector over which said relayis open 23. In"a .n,automatic telephonesystem, a; v connector, a called hne, accessibletromfthe atively energized, and means the operation'of which 1snon-d1rect1vely lnitiatedafterthe connector hasbeen operated intoconnection with the line called for'causing the operation 5 28QInr anautomatic telephone, system, a

connector, a' plurality of called lines accessible trom the, connector,a source ofsignahng current and'terminal therefor specific to eachcircuit path from the. signalingcurrent ter-' minal ofthe connected lineto its companion f 11116, and means controlled over the signalingcurrent terminalof the connectedline to operate therelay.'-

connector, a plurality of called lines accessible from the connector, asource of signaling current having intermittent live periods andterminal thereforspecific to 'eachsaid line, a wiper of ;the' connectorcooperative 1 withthe respective'said terminals when, a line telephonesystenn; a

7 necton'a relay operative to complete-a circuit 29. In an aautomatictelcphone systcm,a i

of the relay only at a predetermined timewith I respect to a live periodotqthe signaling cur-r rent source of theline called.

path fromithesignalingcurrent terminal of the connected line to itscompanion line, and

V 7 means controlledgoverthe signaling current closing a'circult pathbetween the signaling j current source and the connector-includingterminal lofthe connectedjline to obera'te'the relay only at apredetermined time withi7espect to'a live I period; of the correspondingsignaling current source 1;

connector, a plurality-cf;called lines accessible from the connector',fa sourceof signal ing current andterminal" therefor specific to eachsaid line,a'- wiper of the-connector cooperatlve w th the jrespectl ve'said terminals ..ll when a l-inecompanion thereto is connected '30. In:an automatic telephone systein, a

to by the co1inecto1',ja1'elay operative to com- I plete a circuit pathfromlthe signaling current termmal ot the connected line to its'com Jpanion line, andnon directlve means apphed over the Vsignal-in'gcurrentterminal-of the connected line for causing" the operation of therelay responsive to effecting connect-ion totheline called.

wiperiof; the connector cooperative with the respective said terminalswhen a llne comthe-connected line to its," companion line, and

{rent having intermittent live. periods and A v vterminalthereforspecific toeach said line, a

1 specific to eachline for controllingthe appli 1 cation of signalingcurrent toits companion f .line in aspecific manner, a Wiper of the;con-if "necton cooperative with the respectiye saidi fspecificter-minals when alran donisaid line? nee-tor, relay mechanismoperative to prepare I a signaling.currentpathtotheconnectedline,plurality of lines Jzicessible from the con- V l mmalof the,GOIlXIGCtGClg 11110130. operate the connecton ar plurality of linesaccessible fizomi i sponsiye signal devices-on the line each sper crficxto .asaid, branch, signaling current sources; haying characters specifict0. the renon-directivemeans. applied oyer tlie sfigria l-Ii mg currenttermmal of the connected ,line', for causing, the operation ofthev relayre- 'sponsiye-toeffectingconne'ction Withthe-linez sp ective,hranches,]a-1%elay, a Wiper of't'he 1 called but only ata.predeterminedtimewith aconnector, an auxiliary, terminal" of threspect to a, live pence ofv the. corresponding,signaling.currentsource;

e re-- spectire hrancllcsbooperative with thejxyipfer \vhenaj randomsaid branch-is selectedhyt'he connector, means Wh'e'f'eloythe opera ojifof the 'r el'a'yewillfbe' rolled o'verf the Wiper responsive to afsaidhranc'h'heing selected, and

.32; In an automatic telephone. system,

theconnector, a sourceof signaling Cu ran; a busy-test termmalior eachline,-a terminal means for causingftherelay'by itstsai'd operation ,to'apply signaling currentfoyer tliesaid aur ilia fy terminal of theselected line tothe sel'efcfiedline fromfthe source haying the characters p ecifi'cj' to the 'loranchj selected to cperate 1 only'jthecorresponding signal device :on the companion thereto is connected-tobyl the con line";

ear it; telephone system, connector, a

and means-controlledover'saidspecificflten' jiggt diffr fly-g l fi elygi na'l lev' e on the'respective l1ne'3's,av source rent oversaidispecific terminal tojatalking conductor of thecalledilmevfl Mcurrent over the said auxiliary terminal of the" toie'ajc'li s ice,r'el'ayme'chanism, arWifien a 1, .L1 of" tlidconnetdr, an" auxiliarytern'fin'a-l of 111 all tfi p o e r b s i! the respective lines'cooperative with the connection l y o e a eq s b iji wipi-wlienas atline isiconn'ected' to b the t sp i os Q 'i g it ng. current "nswherehvfthe operation 'of e h reiperio e la ie'frel ay niece Haremwin"-bemmanneever mmal therefor i each .Sald tlief Wiperresponsiyetdaiand om aid line controlling the appl cation of signaling cur-f b ffmfi .5 m a s 'f rent to it Companionline in e fie m?"mechanism-Thy is seeamnofi a l' of the connector r iieignalinacuri-nr from isurbeil 1 wlththe respectivesaid terminals when a ran f" h fi pdfigl t6 h H Q'IE-f Tid dom said line companion thereto is connected iif wh i-in said Wipenfofm T pfiflfdf by Connector? relay l e signalingcurrent,and-means nodirect iyell five to Prepare a slgnal 1 path to applied 'afor causinnthesi' 'na-lih current to connected line, and means controlled oveikb a t6Hi ii aifi a 31.9 the said specific terminal of the connected k l gmdline to operate the-relay mechanism only a v ribdgvltflerof; ,1 apredetermined time with correspondence ,5 fw to the requirement of saidspecific manner H,; f W fl9 to apply said signaling current over saidspe 1, 1 fi wf 'e e cific terminal to a talking conductor of thewnnectml' me stgnalcevlces Z 'FW P g Called ling torthe branchegisources -01? .d1fl;erently ,pe-. 34. In a telephone system, aconnector, l i' plurality of lines accessible fromthe connec' 1 -79 l su P-1 .1 tor, a diilerently selectivelyresponsive signaT SR Fm' d 'b f hif r w 19l fl1 h device on the respective said lines, a signaling*- P- hfi 991 m x -l i fil current source specific to each said device, 'Ojithel Q-S f lm gfi fi f m relay, a Wiper of the CODIlQCtOI,i1I1 auxiliary wl w p ea j fipm h' fiP 9 terminal of the respective said lines cooper rhs to cm e r t tive with the wiper when a line is connected iQP QH- h?"1 y Q Q H'B l bQ I to by the connector, means whereby the op lljll'e d0Y6? h W l 6i} 3 PQ W n p L a d branchflee ng:selectedymeans for-causingthe wiper responsiveto arandom said line being selected, and means forcausing the re lay by its sa1d operation to apply signaling selectedline to the selected line from the? source, having the characterspecific to the selected line. i I 35. In a telephone system aconnector, a branched line, each said branch accessible from theconnector over specific bank te minals therefor, differently selectivelre j 38. In a telephone system, a connector, a

' called line accessible from said connector over any one of a pluralityof branches of l the line, a signal device on saidsline-correpen ing toeach saidbranch, a code current sending devicecorresponding to each saidbla nchv for' supplying signaling current inav train of successive liveand dead periods for l. lng application of slgnal ng current to' theregardless of when the branch of the line is of any said codesendingfdevice other than ain'g code current sending deviceand' causethe corresponding slgnahng' ode to applied to the a correspondingtslgnaldevlce to branch "selected.

application to the called line :overj-tliebranclif selected by theconnector, means for preventcalledline except atthe ,beginnin gofa'code, meanswhereby theistarting of the applica tion of a code totlie[called linewillbe dependent of the time of effective Operat on the onecorresponding to the branch selected f selected, and means whereby thebranch of the line selected will determine the correspondoperatelit withspecific correspondence to the .39.;fIn a telephone system,a connector;a

called line accessible from the connectorover any oneof a plurality ofbranches of'the line,

rents in successive "'live anddead means whereby vthea'c urrent will beapplied 'toa called line'b'ranch from the connector only atthe inceptionof a liveYperiod-, 'means 'branchcalled, 1

Wit HBS S WhGIQOfl- I hereunto subscribe called line incorres'pondenceivith the line called responsive to the selection of the called.

41; In a telephone system, a connector, a plurality of called linebranches accessible fromsaid connector, a current supply branch 70specific to eachsaid line branch, means for operating said connector toselect a desired one of said'line branches, means specific to each saidline branches for applyi'n said curperi0ds,775

whereby regardless of the time the connector ';selects a line branchthe'applicatioln of the; 1 i

current thereto from its corresponding sup-.

'ply' branch Will be irrespective 0ftl1e o'perative; position thenassumed bysaid means for applying current over any of said supplybranches other than the one of said means? l corresponding to the branchselected bythe connector, andmeans whereby the specific saidf supplybranch will be applied to the called line in correspondence With line myalmethis sixteenth day of J une, 1923 :PHE BEB M-FB E DL n ing,of;:alive' period, meansi vher'eby the 7 Q applicationpf current to'thefcalled line will i "be independent oftime of efiective operation.

of any said sending device other than the one corresponding tothejbranch' selected ire- V "gardles's of when the branch otthe lineis'sebe" applied correspondingsignaling device.

' 'l( ).*In"a telephone system, acon nectorfal plurality 'ofcalledlinesaccessible fromsaid lectj'ed, means whereby the? branch of the line 1-select e'd will determine the signal device to beepr tf a bythesignaling current byfalso.

"thereby selecting the corresponding current V source andfor causing theselectedgso urce to op'erat'ively effective to only the "connector,.asource ofcurrerit specific to each;

. said'line, means foroperatin'g' said connector,

tofselect a desiredone ofsaid'linesfineans-g' f r for "applying saidsources of current in sue I f v =cess1vel1ve' and deadper1odsgineans'whereby' r V the currentwill be applied gto a "called"line u from the connector only at, the inception; of

is, live period,- Ineans/wheireby regardless,of J '60; i

the ,timethe connector selects a called line Y fl the application i ofthe current; thereto from j the specific source will bejirrespective ofthe time.;of efiecting live and ,deadperiods of l as othersaifdfsources,and means whereby, the Q H specific said source yrill hgappligd to; the

